US9272927B2 - Method for preventing growth of microorganisms, and a combination for the prevention of microbial growth - Google Patents

Method for preventing growth of microorganisms, and a combination for the prevention of microbial growth Download PDF

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US9272927B2
US9272927B2 US12/447,349 US44734907A US9272927B2 US 9272927 B2 US9272927 B2 US 9272927B2 US 44734907 A US44734907 A US 44734907A US 9272927 B2 US9272927 B2 US 9272927B2
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hydantoin
amount
calculated
dosed
peracid
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US20100267791A1 (en
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Marko Kolari
Antti Heinänen
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Kemira Oyj
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Kemira Oyj
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
    • A01N37/16—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing the group; Thio analogues thereof
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/48—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with two nitrogen atoms as the only ring hetero atoms
    • A01N43/50—1,3-Diazoles; Hydrogenated 1,3-diazoles
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N2300/00—Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • C02F1/766—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens by means of halogens other than chlorine or of halogenated compounds containing halogen other than chlorine

Definitions

  • the invention relates to a method for preventing microbial growth in process waters. Moreover, the invention is directed to a combination for the prevention of microbial growth.
  • the invention is particularly suitable for the treatment of industrial process waters, including the treatment of raw and cooling waters.
  • Preferred applications comprise processes of pulp and paper industries, including water circuits of paper and board machines, chemical pulp production plants, and deinking plants, and further, cooling water systems.
  • Peracetic acid is a commonly known biocide. Compared to other biocides, peracetic acid is very inexpensive. In practice it was, however, found that if peracetic acid is the only biocide used, the efficiency thereof is reduced in the long run due to selection of microbes on the paper machine producing higher amounts of extracellular material preventing the penetration of peracetic acid, thus lowering the killing activity thereof.
  • WO 2006/097578 A1 discloses a combination of an oxidizing agent comprising chlorine with a bromine source for the prevention of microbial growth in raw or circulated waters of paper production processes.
  • a preferable oxidizing agent is sodium hypochlorite
  • a preferable bromine source is bromochlorodimethyl hydantoin (BCDMH) or dibromodimethyl hydantoin (DBDMH).
  • BCDMH bromochlorodimethyl hydantoin
  • DBDMH dibromodimethyl hydantoin
  • hypochlorite used are likely to increase the formation of AOX compounds detrimental to the environment.
  • hypochlorite used in great amounts has adverse effects on the papermaking chemistry.
  • a mixture of peracetic acid and dichlorodimethyl hydantoin is known from the document Chinese Journal of Disinfection 2003: 20(4), pages 276-278, where said mixture is said to have synergistic spore destroying activity.
  • a solution containing 500 mg/l of peracetic acid and 300 mg/l of dichlorodimethyl hydantoin (as active chlorine) was studied.
  • the test results showed that the mixture was able to kill 100% of the spores of the bacteria Bacillus subtilis var. niger . It was also active against the bacteria Escherichia coli and Staphylococcus aureus .
  • Weight ratio of peracetic acid to dichlorodimethyl hydantoin was about 1.67:1.
  • a mixture containing considerable amounts of dichlorodimethyl hydantoin is not cost effective. Further, such a concentrated solution may cause corrosion, and for this reason, a corrosion inhibitor was added to said solution.
  • the document suggests the use of said solution as a disinfectant.
  • a composition for the prevention of microbial growth in industrial process waters is known from U.S. Pat. No. 5,980,758 (Nalco Chemical Company), said composition containing peracetic acid and a non-oxidizing biocide.
  • Peracetic acid is said to improve the activity of the non-oxidizing biocide.
  • Said non-oxidizing biocide is benzisothiazoline, carbonimidic dibromide, 1,4-bis(bromoacetoxy)-2-butene or ⁇ -bromo- ⁇ -nitrostyrene.
  • Peracetic acid may be added to process waters prior to the addition of the non-oxidizing biocide.
  • a composition for the prevention of microbial growth in industrial process waters is known from the document WO 03/062149 (Lonza Inc.), said composition containing an oxidizing or a non-oxidizing biocide, and a triamine compound.
  • Suitable oxidizing biocides include, for example, peracetic acid, ozone, hypochlorite, chlorine dioxide, bromochlorodimethyl hydantoin, dichloromethylethyl hydantoin, dichlorodimethyl hydantoin, etc.
  • Peracetic acid is widely used for the prevention of microbes on paper machines. As a problem, it has now however been found that peracetic acid alone is not enough to provide a long-lasting biocidal activity, that is, it needs another biocide as a booster. Compounds known from the above documents are, however, associated with drawbacks that will be eliminated by the present invention.
  • An object of the invention is to provide a cost effective method for the prevention of microbes that is acceptable for the environment and non-corrosive in comparison e.g. to hypochlorite or concentrated solutions.
  • a method for the prevention of microbial growth in process waters wherein first a peracid compound and thereafter a halogenated dialkyl hydantoin are dosed into said process water.
  • Said peracid compound may be an organic peracid compound or percarbonate.
  • Said organic peracid compound is preferably peracetic acid or performic acid, or a mixture thereof.
  • Peracetic acid may be an equilibrium solution thereof, or distilled peracetic acid.
  • Sodium percarbonate is a preferable percarbonate.
  • Alkyl groups in halogenated dialkyl hydantoin may be identical or different, being preferably methyl or ethyl.
  • Halogen substituent at position 1 or 3 is preferably chloro or bromo.
  • Preferable halogenated dialkylhydantoins include monochlorodimethyl hydantoin (MCDMH), dichlorodimethyl hydantoin (DCDMH), bromochlorodimethyl hydantoin (BCDMH), dibromodimethyl hydantoin (DBDMH) or dichloromethylethyl hydantoin (DCMEH), or a mixture thereof.
  • Weight ratio of the peracid compound to halogenated dialkyl hydantoin is preferably at least 2:1, the amount of the peracid compound being calculated as active agent, while the amount of halogenated dialkyl hydantoin is calculated as active chlorine.
  • Said ratio is preferably between 2:1 and 125:1, more preferably between 2:1 and 75:1, and most preferably between 2.5:1 and 30:1.
  • Peracid compound may be dosed in an amount of 0.2 to 45 mg/l, preferably 0.2 to 30 mg/l and more preferably 0.2 to 15 mg/l, calculated as active agent.
  • Halogenated dialkyl hydantoin may be dosed in an amount of 0.1 to 25 mg/l, preferably 0.2 to 15 mg/l, and more preferably 0.2 to 6 mg/l, calculated as active chlorine.
  • the total amount of the peracid compound and halogenated dialkyl hydantoin may range between 0.3 and 70 mg/l, preferably between 0.4 and 45 mg/l.
  • a combination for the prevention of microbial growth comprising compounds to be dosed separately, said compounds being a peracid compound to be dosed first, and a halogenated dialkyl hydantoin to be dosed after the peracid compound, the weight ratio of the peracid compound to the halogenated dialkyl hydantoin being at least 2:1, wherein the amount of the peracid compound is calculated as active agent, while the amount of halogenated dialkyl hydantoin is calculated as active chlorine.
  • the peracid compound is dosed first, followed by the treatment of the process water treated with said peracid compound with the halogenated dialkyl hydantoin prior to attenuation of the activity of the peracid, without an extended interval between the treatments.
  • this is preferably carried out by dosing the peracid compound for instance at suction side of a pump resulting in rapid and efficient mixing, followed by the dosage of said halogenated dialkyl hydantoin in the same pipeline after the pump, or to the next tank.
  • the solution of choice depends among other things on the flow rate, and it is crucial the treatment is directed to the substantially same water fraction.
  • the interval between the dosages of the peracid compound and halogenated dialkyl hydantoin may be from 0.5 seconds to 60 minutes, preferably from 10 seconds to 60 minutes, more preferably between 20 seconds and 30 minutes.
  • the dosage of said peracid compound may be continuous or intermittent.
  • the dosage of said halogenated dialkyl hydantoin may be continuous or intermittent. In case of intermittent dosage, it is substantial for the desired effect according to the invention that said halogenated dialkyl hydantoin is dosed into to the same water fraction as said peracid compound dosed first.
  • redox of process waters can be increased, and thus most of the microbes can be killed by an environmentally acceptable agent less corrosive than hypochlorite.
  • the more expensive halogenated dialkyl hydantoin to be dosed after a predetermined interval is not consumed in undue reactions with reducing compounds irrelevant to microbes.
  • Efficient killing and prevention of rapid regrowth of microbes can be guaranteed with only low amounts of halogenated dialkyl hydantoin since these compounds are able to penetrate into microbial cells efficiently, thus making sure that also more resistant microbes get killed.
  • the combination of peracetic acid and MCDMH is particularly preferred.
  • the combination of peracetic acid and BCDMH is particularly preferred.
  • the invention is directed to the prevention of microbial growth, all microorganisms present in process waters generally being targeted, such as aerobic bacteria, facultatively anaerobic bacteria, sulfate reducing bacteria, filamentous bacteria, bacteria forming biofilms, yeasts, molds, and protozoa.
  • the invention is particularly suitable for the treatment of process waters including raw waters and water in cooling systems.
  • Particularly suitable applications include circulated waters in the production of paper and board, chemical, or reclaimed paper pulps, circulated cooling waters, and waters in cooling towers.
  • Other applications include cooling and circulating waters in food industry and metal industry, and further waters in cooling systems of hospitals (prevention of the bacterium Legionella ).
  • the invention is also useful for the treatment of ballast waters of ships.
  • Yet another application comprises waters in oil fields.
  • FIG. 1 shows testing of bactericidal activity against aerobic bacteria present in broke where killing efficacy of BCDMH and ePAA used alone and in combination were compared
  • FIG. 2 shows testing of bactericidal activity against aerobic bacteria present in broke where efficacy of BCDMH, and combinations of ePAA+BCDMH were compared
  • FIG. 3 shows testing of bactericidal activity against aerobic bacteria present in broke where killing efficacy of BCDMH and ePAA used alone and in combination were compared
  • FIG. 4 shows testing of bactericidal activity against aerobic bacteria present in wire pulper sample where killing efficacy of BCDMH and ePAA used alone and in combination were compared.
  • FIGS. 5 and 6 show testing of bactericidal activity against aerobic bacteria present in circulation water from an alkaline fine paper machine where killing efficacy of BCDMH, MCDMH and PFA used alone and in combination were compared.
  • the combination of ePAA+BCDMH provides evident synergy in biocidal activity, that is, the result is better when the compounds are used together.
  • the activity seems to be similar, but a cost reduction of several tens of percents is obtained when expenses are taken into consideration.
  • ePAA, BCDMH and MCDMH used in tests are commercially available products.
  • Equilibrium solution of peracetic acid used, ePAA had the following composition: about 15% of peracetic acid, about 24% of acetic acid, and about 15% of hydrogen peroxide, all percentages being by weight.
  • concentrations are expressed as concentrations of the products, and thus for instance 60 ppm of ePAA corresponds to about 9 ppm of PAA as active agent, 10 ppm of BCDMH corresponds to about 3 ppm of active chlorine, while 60 ppm of MCDMH corresponds to about 6 ppm of active chlorine.
  • Dilute broke of a board machine (pH 7.8, oxidation reduction potential (ORP) 40 mV) was divided into 10 separate jars, and biocides to be tested were dosed. Concentrations are expressed in ppm (mg/l) of the commercially available product.
  • ORP oxidation reduction potential
  • a wire pulper sample (pH 7.9, ORP 46 mV) was divided into jars, followed by similar testing as above.
  • a test for destructing a biofilm was performed as described in the document FI 117056 B (Kemira Oyj).
  • a biofilm was pregrown on lidplates having stainless steel pegs (3 d, 45° C., agitation at 150 rpm.).
  • Clear filtrate of a fine paper machine served as the water (pH 7.6, ORP 71 mV), while a mixture of adherent bacteria ( Deinococcus geothermalis, Pseudoxanthomonas taiwanensis and Meiothermus silvanus ) grown in the laboratory was used for inoculation.
  • the lids were removed from the clear filtrate used for cultivation, washed with tap water and placed on plastic plates with 12 wells, one peg per well. 3.5 ml of the clear filtrate from the same paper machine, and the biocides to be tested were added in advance to each well.
  • the pegs with biofilms were first immersed into the wells for 15 minutes, followed by removal of the plates for a moment for the addition of the other components of the biocidal combinations to the wells. Exposure to biocides was continued to attain a total contact time of 3 hours.
  • biofilms viability of the biofilms was determined by transferring the peglids to fresh 12-well plates where each well contained 2 ml of sterile cultivation broth, followed by cultivating the plates for 19 hours at 45° C. while mixing at 150 rpm. During this stage, survived biofilm bacteria formed a new biofilm on the walls of the wells of the clean plate. It was thus possible to evaluate the efficiency of the biocide treatments for biofilm destruction by comparing the extent of the new biofilms formed on the walls of the wells. To facilitate this evaluation, the wells were emptied, followed by staining of the biofilms with safranin.
  • the only addition completely inhibiting the new biofilm ( ⁇ ) was a combination comprising 80 ppm of the equilibrium solution of peracetic acid, ePAA, dosed first, and 20 ppm of MCDMH dosed after ePAA.
  • Circulation water (pH 8.2, ORP+169 mV) was collected from an alkaline fine paper machine (producing uncoated copy paper) and divided in 11 plastic containers. When two different biocides were dosed in to same container, the peracid was dosed first, the sample mixed thoroughly, and the second biocide was added within 5 to 10 minutes. All biocide dosages are reported as ppm (mg/l) of the commercial product, for example 20 ppm of performic acid (PFA) equilibrium product equals about 2 ppm as performic acid active substance, 12 ppm of BCDMH product equals about 4 ppm as active chlorine and 30 ppm of MCDMH product equals about 3 ppm as active chlorine.
  • PFA performic acid
  • Untreated reference sample contained cultivable aerobic bacteria 2.0 ⁇ 10 5 CFU/ml (3 h) and 1.6 ⁇ 10 5 CFU/ml (1 day). All treatments reduced the amount of viable bacteria, when measured 3 hours after the biocide dosing ( FIG. 5 ). Killing of bacteria was most efficient in those containers where ⁇ 15 ppm of PFA, 12 ppm of BCDMH, 45 ppm of MCDMH was added alone or where PFA was added with MCDMH.
  • FIG. 6 shows that within 1 day active re-growth of bacteria had occurred in all those containers that had been treated with PFA, BCDMH or MCDMH only and had yielded an efficient kill (>3 log reduction of viable bacteria count).
  • PFA first, followed by MCDMH peracid and halogenated dialkylhydantoin

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US12/447,349 2006-11-09 2007-11-07 Method for preventing growth of microorganisms, and a combination for the prevention of microbial growth Active 2031-09-20 US9272927B2 (en)

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FI20060986 2006-11-09
FI20060986A FI119800B (fi) 2006-11-09 2006-11-09 Menetelmä mikro-organismien kasvun estämiseksi ja mikro-organismien kasvua estävä yhdistelmä
PCT/FI2007/000270 WO2008056025A2 (en) 2006-11-09 2007-11-07 Method for preventing growth of microorganisms, and a combination for the prevention of microbial growth

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EP (1) EP2079308B1 (ru)
CN (1) CN101553120B (ru)
AR (1) AR063582A1 (ru)
BR (1) BRPI0718661B1 (ru)
CA (1) CA2669744C (ru)
ES (1) ES2602557T3 (ru)
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WO2012166997A2 (en) 2011-05-31 2012-12-06 Clean Chemistry, Llc Electrochemical reactor and process
FI127073B (en) * 2011-12-30 2017-10-31 Kemira Oyj Improvement of biocidal action of peracids
WO2013107941A1 (en) * 2012-01-20 2013-07-25 Kemira Oyj Device and method for monitoring biocide dosing in a machine
US9517955B2 (en) 2012-09-07 2016-12-13 Clean Chemistry, Llc System and method for generation of point of use reactive oxygen species
RU2574052C2 (ru) * 2013-10-02 2016-01-27 Общество с ограниченной ответственностью "Банмарк" Способ ингибирования микроорганизмов в целлюлозно-бумажной промышленности
FI126082B (en) 2014-07-15 2016-06-15 Kemira Oyj Procedure to prevent sludge formation
WO2016037149A1 (en) 2014-09-04 2016-03-10 Clean Chemistry, Inc. Method of water treatment utilizing a peracetate oxidant solution
CA2981034A1 (en) 2015-03-26 2016-09-29 Clean Chemistry, Inc. Systems and methods of reducing a bacteria population in high hydrogen sulfide water
US10883224B2 (en) 2015-12-07 2021-01-05 Clean Chemistry, Inc. Methods of pulp fiber treatment
EP3386948A4 (en) 2015-12-07 2019-06-12 Clean Chemistry Inc. PROCESSES FOR PROCESSING PAPER PULP FIBERS
MX2018007422A (es) 2015-12-16 2018-08-15 Ecolab Usa Inc Composiciones de acido peroxiformico para limpieza por filtracion en membrana.
WO2017181005A1 (en) 2016-04-15 2017-10-19 Ecolab Usa Inc. Performic acid biofilm prevention for industrial co2 scrubbers
US11136714B2 (en) 2016-07-25 2021-10-05 Clean Chemistry, Inc. Methods of optical brightening agent removal
US10524470B2 (en) 2016-12-15 2020-01-07 Ecolab Usa Inc. Peroxyformic acid compositions for membrane filtration cleaning in energy services
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ES2602557T3 (es) 2017-02-21
US20100267791A1 (en) 2010-10-21
PL2079308T3 (pl) 2017-04-28
CN101553120A (zh) 2009-10-07
WO2008056025A3 (en) 2008-11-27
BRPI0718661A2 (pt) 2014-02-04
CA2669744A1 (en) 2008-05-15
FI119800B (fi) 2009-03-31
EP2079308B1 (en) 2016-08-17
AR063582A1 (es) 2009-02-04
FI20060986A0 (fi) 2006-11-09
WO2008056025A2 (en) 2008-05-15
RU2448463C2 (ru) 2012-04-27
CA2669744C (en) 2016-09-13
RU2009119389A (ru) 2010-12-20
FI20060986A (fi) 2008-05-10
CN101553120B (zh) 2014-02-19
BRPI0718661B1 (pt) 2018-11-21

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